Kapt3: Write stub class files with metadata (needed for incremental compilation)

compiler/testData/codegen/light-analysis/jvmOverloads/simpleJavaCall.txt

@@ -1,3 +1,4 @@
+@kotlin.Metadata
 public final class C {
     public method <init>(): void
     public synthetic static method foo$default(p0: C, p1: java.lang.String, p2: java.lang.String, p3: int, p4: java.lang.Object): java.lang.String
@@ -6,6 +7,7 @@ public final class C {
     public final @kotlin.jvm.JvmOverloads @org.jetbrains.annotations.NotNull method foo(@org.jetbrains.annotations.NotNull p0: java.lang.String, @org.jetbrains.annotations.NotNull p1: java.lang.String): java.lang.String
 }
 
+@kotlin.Metadata
 public final class SimpleKt {
     public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
 }